# AT YOUR PERIL: Yet another oil discussion. 0W-20, 5W-30 & 5W-40 **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [June 1, 2026, 6:34pm UTC](https://community.cartalk.com/t/at-your-peril-yet-another-oil-discussion-0w-20-5w-30-5w-40/205774 "2026-06-01T18:34:21Z")\ **Posts on this page:** 1\ **Showing post:** 1
**Author:** ![TheWonderful90s](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/thewonderful90s/32/29584_2.png) [@TheWonderful90s](https://community.cartalk.com/u/TheWonderful90s)\ **Post date:** [June 1, 2026, 6:34pm UTC](https://community.cartalk.com/t/at-your-peril-yet-another-oil-discussion-0w-20-5w-30-5w-40/205774/1 "2026-06-01T18:34:21Z")
Title: We Tested 0W-20, 5W-30 & 5W-40 in the ENGINE — One Clear Winner! They test the 3 oils and do oil analysis to measure the wear metals to determine wear. [![](https://global.discourse-cdn.com/cartalk/original/3X/8/6/863740de4ff059ec31fc5d07263ee722818ddc38.jpeg "We Tested 0W-20, 5W-30 & 5W-40 in the ENGINE — One Clear Winner!") ](https://www.youtube.com/watch?v=KMV71AlPwyU&t=189) Edit, there is no need to report the topic and have it removed from the forum because you think it is low quality content, AI generated, or because you disagree with it. There is no forum rule against referring to AI enhanced content. It could be a machine translation from a different language, or an AI altered repost of another quality article. Yes it is sensationalized like a lot of stuff on youtube is. The image of the video showing the sludge is exaggerated. A lot of people believe this stuff though, so you can discuss your reasons for why you disagree if you like. That’s what this place is for. It is true that some European vehicles with the same engine specify thicker oil than the US market version. I don’t know how you can get around that. Here is another thing I found on a random discussion forum about a Honda. It also talks badly about a particular 0W20 oil. > [@](#): > > Switched to my preferred oil 5w30 Valvoline. Mostly because I can get it for like 26$ for 5qts and I always run the high mileage version full synthetic. As you > can see from the results, firstly there is nearly no fuel dilution. Biggest issue now is viscosity degradation. 100 degree cSt when the oil is new should be around 10.7 according to SAE tests and valvolines own documentation, yet over 4000 miles it fell down to 8.3. That is a 22% reduction in viscosity. Although oil rarely will reach 100C in the oil pan, it will exceed that in the turbo charger. > > Over all, might switch to a higher strength 5w30 if I can find a steady supply of it under 30$ for 5qts in my area. But just based off this data, switching to a 5w30 oil is already MUCH better. Honda’s 0w20 is obviously trash, doing pretty much nothing to really protect the engine, flash point is so low that its lower than what I would get with 0w16 on my toyota’s, and the fuel dilution even on the k20 is a problem people keep denying yet I have evidence. > > Either way, Just wanted to put that out there. > The data is all here, trolls be gone, I won’t respond or participate in arguments of which oil is better or which brand or how none of this matters because engines are “so high tech and engineering is so good” etc. Engineering is always limited by the finance department, source, I am an engineer. Source: [0w20 vs 5w30 Oil Results - Accord 2.0T | 2018 Honda Accord Forum](https://www.accordxclub.com/threads/0w20-vs-5w30-oil-results-accord-2-0t.10014/) --- _[View the full topic](https://community.cartalk.com/t/at-your-peril-yet-another-oil-discussion-0w-20-5w-30-5w-40/205774)._